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A food app takes one order from one restaurant. The restaurant creates its menu dishes; the order creates its own items, each pointing at a menu dish; payment is delegated to a UPI or card object; the order moves PLACED → PAID → DELIVERED.
Use enum OrderStatus { PLACED, PAID, DELIVERED }, an interface PaymentMethod (boolean pay(int amount), String label()), Restaurant (composes Dishes), and Order (composes OrderItems).
dish NAME PRICE, add NAME QTY, pay upi|card, deliver or bill. UPI refuses a payment above Rs. 2000.dish prints nothing. add: ORDER LOCKED (not PLACED), NO DISH NAME, BAD QTY (qty < 1), or ADDED QTY x NAME. pay: ALREADY PAID, EMPTY ORDER, PAID T BY LABEL or DECLINED T BY LABEL. deliver: NOT PAID, DELIVERED or ALREADY DELIVERED. bill: one line per item QTY x NAME = Rs. A, then TOTAL T STATUS S.Example 1
Input
1000 9 dish Dosa 80 dish Coffee 30 add Dosa 2 add Pizza 1 add Coffee 0 deliver pay upi add Coffee 1 bill
Output
ADDED 2 x Dosa NO DISH Pizza BAD QTY NOT PAID PAID 160 BY UPI ORDER LOCKED 2 x Dosa = Rs. 160 TOTAL 160 STATUS PAID
Pizza is not on the menu, quantity 0 is refused, and after paying the order is locked.
Example 2
Input
500 6 dish Thali 300 add Thali 3 pay card pay upi deliver deliver
Output
ADDED 3 x Thali DECLINED 900 BY CARD PAID 900 BY UPI DELIVERED ALREADY DELIVERED
The card limit 500 is too low for 900; UPI accepts it.
Try the problem first. Open one hint at a time.
Every command first checks the status: an if on status != OrderStatus.PLACED blocks changes after payment.
Restaurant.find(name) returns the menu Dish or null; OrderItem keeps that Dish reference and a quantity.
pay builds or picks the payment object and only changes the status when method.pay(total) returns true.
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